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Brand: Phase II
Phase II PHT-3500 Portable Hardness Tester
Description
Overview
The Phase II PHT-3500 is a portable Leeb (dynamic rebound) hardness tester with a built-in thermal mini-printer, from the Phase II+ range of portable hardness testers. It measures the rebound of a spring-loaded impact body and converts the Leeb value to Brinell, Rockwell B and C, Vickers and Shore scales.
The instrument is used for hardness checks on large or installed metal parts in the field or on the shop floor, where cutting a sample or moving the part to a bench tester is not practical. It is supplied with impact device D and a calibrated test block for verification before each measurement series.
Key Features
- Leeb measuring range 200 to 960 HL
- Automatic conversion to Brinell, Rockwell B and C, Vickers and Shore
- Accuracy ±0.5% (at L = 800), repeatability ±4 HL
- Built-in thermal mini-printer and USB output
- Standard impact device D; optional DC, D+15, DL, G and C devices
- Compact handheld unit, 150 × 74 × 32 mm, 245 g
Technical Specifications
| Parameter | Value |
|---|---|
| Model | PHT-3500 |
| Brand | Phase II (Phase II+) |
| Method | Leeb dynamic rebound |
| Measuring range | 200 to 960 HL |
| Accuracy | ±0.5% (referred to L = 800) |
| Repeatability | ±4 HL |
| Conversion scales | HB, HRB, HRC, HV, HS |
| Standard impact device | D |
| Optional impact devices | DC, D+15, DL, G, C |
| Output | USB, built-in thermal printer |
| Operating temperature | 5 to 104 °F |
| Dimensions | 150 × 74 × 32 mm |
| Weight | 245 g |
| Standard accessories | Impact device D, calibrated test block, carry case, cleaning brush, operation manual |
| Test standard | Meets ASTM A956 |
| Display | Large LCD with backlight |
| Impact device recognition | Automatic identification of the connected impact device |
| Statistics | Automatic mean, minimum and maximum values |
| Limit function | Upper and lower limit setting with alarm |
| Battery | 6 V NiMH rechargeable |
| Charger | 9 V / 500 mA |
| Continuous working time | About 150 hours with backlight off and no printing |
| Printer paper | Thermal roll, 57.5 mm wide, 30 mm diameter |
| Communication interface | USB 1.1 |
Applications
Incoming material inspection, verification of heat treatment and weld hardness, maintenance checks on shafts, rolls, pressure parts and castings, and general workshop hardness testing. Compatible materials include steel and cast steel, alloy tool steel, stainless steel, grey and spheroidal cast iron, cast aluminium, brass, bronze and wrought copper alloys. Typical users are fabrication, oil and gas, power and petrochemical maintenance and inspection teams in Oman and the GCC.
Phase II PHT-3500 System Compatibility
The PHT-3500 is supplied as a kit made up of the base instrument, a type D impact device, a calibrated test block, a carry case, a cleaning brush and the operation manual. The instrument recognises the impact device that is plugged in, so changing from the standard D device to one of the optional DC, D+15, DL, G or C devices does not need a manual probe-type setting.
Phase II lists three accessories for the tester by part number. The PHT1500-300 is a set of 12 support rings for curved and hard-to-reach surfaces. The PHT1300-05 is a double-sided test block, and the PHT130001-CERT is a NIST-certified test block for users who need traceable verification of the instrument.
Operation follows the usual Leeb sequence: load the impact body, place the impact device on the work surface and press the release button to take the reading. Results can be converted to Brinell, Rockwell B and C, Vickers and Shore, checked against user-set limits, stored, printed on the built-in thermal printer or sent out through the USB port.
Phase II PHT-3500 Maintenance Notes
The tester runs on a 6 V NiMH rechargeable pack charged from a 9 V / 500 mA charger, and a battery indicator is shown on the display. Phase II quotes about 150 hours of continuous work with the backlight off and without printing; regular printing and backlight use shorten this. The built-in printer takes thermal paper 57.5 mm wide on a roll no larger than 30 mm in diameter, so keep spare rolls of that size with the kit. A cleaning brush is included for the impact device, and the supplied test block should be used for routine verification of readings.
Why Seven Star LLC
Seven Star LLC supplies Phase II hardness testers and inspection instruments to manufacturing, inspection and maintenance teams across Oman and the GCC. Before quoting, we confirm the required hardness scale, impact device and part geometry (thin, curved or small parts may need an optional impact device or support) so that the instrument suits the actual test work.
Request a Quote for Phase II PHT-3500 Portable Hardness Tester
Submit your inquiry through our Inquiry Form with the model PHT-3500, quantity, the hardness scale required, the material and geometry of the parts to be tested and any optional impact devices or test blocks. We will confirm the configuration and respond with a formal quotation.
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How the Phase II PHT-3500 works
A spring-loaded impact body strikes the test surface. The instrument measures the rebound of the impact body. It converts the Leeb value to the chosen hardness scale.
Where the Phase II PHT-3500 is used
- Incoming material inspection
- Heat treatment checks
- Weld hardness checks
- Shafts, rolls and castings
- General workshop hardness testing
Selection checklist for the Phase II PHT-3500
- Material to be tested
- Part size and weight
- Impact device type
- Hardness scale needed
- Printer need
- Output type
- Battery life
- Accessories
Installation, commissioning and maintenance notes for the Phase II PHT-3500
Charge the battery before first use and fit the impact device. Check the reading on the test block before each series. Clean the impact device with the brush at regular intervals.
Requesting a quotation for the Phase II PHT-3500
Please send the material, the impact device and the quantity needed. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.
Phase II PHT-3500 tester type
It is a portable Leeb hardness tester.
Phase II PHT-3500 range
It belongs to the Phase II+ range of portable hardness testers.
Phase II PHT-3500 method
It uses the Leeb dynamic rebound method.
Phase II PHT-3500 printer
It has a built-in thermal mini-printer.
Phase II PHT-3500 field use
It checks large or installed metal parts in the field or on the shop floor.
Phase II PHT-3500 no sampling
No sample needs to be cut and no part needs to move to a bench tester.
Phase II PHT-3500 measuring range
The measuring range is 200 to 960 HL.
Phase II PHT-3500 scales
It converts to Brinell, Rockwell B and C, Vickers and Shore.
Phase II PHT-3500 standard device
The standard impact device is type D.
Phase II PHT-3500 optional devices
Optional impact devices are DC, D+15, DL, G and C.
Phase II PHT-3500 device recognition
It identifies the connected impact device automatically.
Phase II PHT-3500 display
The display is a large LCD with backlight.
Phase II PHT-3500 statistics
It calculates the mean, minimum and maximum values.
Phase II PHT-3500 limits
Upper and lower limits can be set with an alarm.
Phase II PHT-3500 output
Output is by USB or the built-in printer.
Phase II PHT-3500 USB
The communication interface is USB 1.1.
Phase II PHT-3500 battery
The battery is a 6 V NiMH rechargeable pack.
Phase II PHT-3500 charger
The charger is 9 V at 500 mA.
Phase II PHT-3500 working time
Continuous working time is about 150 hours with the backlight off and no printing.
Phase II PHT-3500 paper
The printer paper is a thermal roll 57.5 mm wide.
Phase II PHT-3500 temperature
Operating temperature runs from 5 to 104 degrees F.
Phase II PHT-3500 size
It measures 150 x 74 x 32 mm.
Phase II PHT-3500 weight
It weighs 245 g.
Phase II PHT-3500 accessories
Accessories are the impact device D, a test block, a carry case, a cleaning brush and a manual.
Hardness records for the Phase II PHT-3500
Record the part, the scale and the date of each series.
Choosing the right Phase II PHT-3500 impact device
Choose the impact device from the part size and the surface condition.
Datasheets & Documents
- Instruction Manual Phase II PHT-3500 Portable Hardness Tester Manual Download
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About brand
Phase II is an American maker of material testing and precision measuring tools, incorporated in 1982 and headquartered in Upper Saddle River, New Jersey. Its range covers Rockwell, Brinell, Vickers and portable hardness testers, surface roughness testers, ultrasonic and coating thickness gauges, durometers, force gauges and vibration meters. Its portable Leeb hardness testers convert readings to Brinell, Rockwell, Vickers and Shore scales.
Seven Star LLC sources and supplies Phase II portable hardness testers for fabrication and inspection work in Oman, including the PHT-3500 listed on this page.
Phase II company profile
| Founded | Incorporated 1982 |
|---|---|
| Headquarters | Upper Saddle River, New Jersey, USA |
| Memberships | AMTMA, ASNT and ASTM |
| Product families | Rockwell, Brinell, Vickers and portable hardness testers, roughness testers, thickness gauges, durometers, force gauges |
Phase II portable hardness testing methods
Phase II offers portable testers in several methods; the PHT-3500 is a Leeb tester normally supplied with impact device D. Dynamic impact (Leeb) testers measure the rebound of an impact body and convert the result to Rockwell, Brinell, Vickers and Shore values; impact devices D, DC, DL, D+15, C and G suit different part sizes and hardness levels. Ultrasonic contact impedance (UCI) testers use a vibrating rod with a diamond tip and can test metal as thin as 2 mm.
Ordering a Phase II hardness tester: what we need
Send the model code, here PHT-3500, and describe the parts: material, approximate hardness, wall thickness, weight and surface finish. These decide the impact device or probe. Say if you need a test block or a spare impact body. Inspection companies in the GCC should name the test standard their client requires.
Facts checked against Phase II company pages and product catalogues, October 2026.
Browse Phase II products by category: Portable Test & Measurement.
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Frequently Asked Questions
What is the Phase II PHT-3500 used for?
The PHT-3500 is a portable hardness tester for the hardness measurement of metal components in the field and in the workshop.
How does a portable hardness tester work?
The instrument applies a defined indenter to the test surface and derives the hardness value from the measured response, with conversion to the selected scale.
Why use a portable tester instead of a bench machine?
Portable testers give a fast hardness reading without cutting a sample or moving the component to a bench machine, practical for large and installed parts.
How is the test surface prepared?
The test location is cleaned and prepared flat so that the reading reflects the material hardness rather than the surface condition.
How is the calibration checked?
The instrument is used with the manufacturer test block to confirm the calibration before a measurement series.
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